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Unpaid losses and loss expenses (Narrative) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2004
Unpaid Losses and Loss Expenses [Line Items]            
Net losses and loss expenses incurred in prior years $ (546) $ (527) $ (530)      
Unallocated loss adjustment expenses due to operating expenses paid and reserved (10,030) (10,176) (9,878)      
A & E - loss reserves, net - closing 980 1,041        
A & E - incurred activity, net 162 [1] 210        
NICO reinsurance protection on losses and loss expenses 466          
Incurred activity 9,484 9,649 9,348      
NICO reinsurance protection on losses and loss expenses incurred on or before 12/31/1996, net of retenion 1,000          
NICO retention for losses and loss expenses incurred on or before 12/31/1996 $ 721          
NICO pro-rata share of reinsurance protection (percent) 75.00%          
Dividend retention fund established by INA Financial Corporation $ 50          
Required minimum balance under the dividend retention fund 50          
Contributions to the dividend retention fund       $ 35 $ 15  
Minimum contribution from the dividend retention fund to Century not required for XOL agreement 200          
Reinsurance coverage to Century provided by ACE INA under XOL 800          
Statutory surplus of century 25          
Century Statutory Basis Losses Cede To X O L 335          
INA Holdings contibutions to Century in exchange for a surplus note           $ 100
Aggregate reinsurance balances ceded by active ACE companies to Century 1,200 1,100        
Century's carried gross reserves (including reserves ceded by active ACE companies) 1,900 2,100        
Insurance - Overseas General            
Unpaid Losses and Loss Expenses [Line Items]            
Net losses and loss expenses incurred in prior years (343) (391) (299)      
Global Reinsurance            
Unpaid Losses and Loss Expenses [Line Items]            
Net losses and loss expenses incurred in prior years (119) (63) $ (84)      
Other lines | Global Reinsurance            
Unpaid Losses and Loss Expenses [Line Items]            
Net losses and loss expenses incurred in prior years (54)          
Long tail | Insurance - Overseas General            
Unpaid Losses and Loss Expenses [Line Items]            
Net losses and loss expenses incurred in prior years (166) (181)        
Long tail | Global Reinsurance            
Unpaid Losses and Loss Expenses [Line Items]            
Net losses and loss expenses incurred in prior years   (52)        
Long tail | Casualty | Insurance - Overseas General            
Unpaid Losses and Loss Expenses [Line Items]            
Net losses and loss expenses incurred in prior years (140) (102)        
Long tail | Casualty | 2011 to 2013 | Insurance - Overseas General            
Unpaid Losses and Loss Expenses [Line Items]            
Net losses and loss expenses incurred in prior years   46        
Long tail | Casualty | 2010 and prior | Insurance - Overseas General            
Unpaid Losses and Loss Expenses [Line Items]            
Net losses and loss expenses incurred in prior years   (148)        
Long tail | Casualty | 2009 and prior | Global Reinsurance            
Unpaid Losses and Loss Expenses [Line Items]            
Net losses and loss expenses incurred in prior years (23) (25)        
Long tail | Casualty | 2010 | Insurance - Overseas General            
Unpaid Losses and Loss Expenses [Line Items]            
Net losses and loss expenses incurred in prior years (175)          
Long tail | Casualty | 2014 and prior | Insurance - Overseas General            
Unpaid Losses and Loss Expenses [Line Items]            
Net losses and loss expenses incurred in prior years 35          
Long tail | Financial solutions business | Insurance - Overseas General            
Unpaid Losses and Loss Expenses [Line Items]            
Net losses and loss expenses incurred in prior years   (27)        
Long tail | Financial solutions business | 2011 to 2013 | Insurance - Overseas General            
Unpaid Losses and Loss Expenses [Line Items]            
Net losses and loss expenses incurred in prior years   71        
Long tail | Financial solutions business | 2010 and prior | Insurance - Overseas General            
Unpaid Losses and Loss Expenses [Line Items]            
Net losses and loss expenses incurred in prior years   (98)        
Long tail | Other lines | Insurance - Overseas General            
Unpaid Losses and Loss Expenses [Line Items]            
Net losses and loss expenses incurred in prior years (26) (52)        
Long tail | Other lines | Global Reinsurance            
Unpaid Losses and Loss Expenses [Line Items]            
Net losses and loss expenses incurred in prior years (42)          
Long tail | Professional liability, including medical malpractice | 2010 and prior | Global Reinsurance            
Unpaid Losses and Loss Expenses [Line Items]            
Net losses and loss expenses incurred in prior years (33)          
Long tail | Professional liability, including medical malpractice | 2009 and prior | Global Reinsurance            
Unpaid Losses and Loss Expenses [Line Items]            
Net losses and loss expenses incurred in prior years   (34)        
Short tail | Insurance - Overseas General            
Unpaid Losses and Loss Expenses [Line Items]            
Net losses and loss expenses incurred in prior years (177) (210)        
Short tail | Other lines | Global Reinsurance            
Unpaid Losses and Loss Expenses [Line Items]            
Net losses and loss expenses incurred in prior years (12)          
Short tail | Other lines | 2014 and prior | Insurance - Overseas General            
Unpaid Losses and Loss Expenses [Line Items]            
Net losses and loss expenses incurred in prior years (34)          
Short tail | Personal Lines | 2012 to 2013 | Insurance - Overseas General            
Unpaid Losses and Loss Expenses [Line Items]            
Net losses and loss expenses incurred in prior years (26)          
Short tail | Personal Lines | 2011 to 2013 | Insurance - Overseas General            
Unpaid Losses and Loss Expenses [Line Items]            
Net losses and loss expenses incurred in prior years   (25)        
Short tail | Property and inland marine lines | Insurance - Overseas General            
Unpaid Losses and Loss Expenses [Line Items]            
Net losses and loss expenses incurred in prior years   (136)        
Short tail | Property and inland marine lines | 2013 and prior | Insurance - Overseas General            
Unpaid Losses and Loss Expenses [Line Items]            
Net losses and loss expenses incurred in prior years (90)          
Short tail | Property and inland marine lines | 2012 and prior | Insurance - Overseas General            
Unpaid Losses and Loss Expenses [Line Items]            
Net losses and loss expenses incurred in prior years   (92)        
Short tail | Property and inland marine lines | 2013 | Insurance - Overseas General            
Unpaid Losses and Loss Expenses [Line Items]            
Net losses and loss expenses incurred in prior years   (44)        
Short tail | Aviation lines [Domain] | 2010 and prior | Insurance - Overseas General            
Unpaid Losses and Loss Expenses [Line Items]            
Net losses and loss expenses incurred in prior years   (30)        
Insurance - Overseas General            
Unpaid Losses and Loss Expenses [Line Items]            
Prior period net unpaid reserves represented by prior period development (percent)     (3.80%)      
Global Reinsurance            
Unpaid Losses and Loss Expenses [Line Items]            
Prior period net unpaid reserves represented by prior period development (percent)     (3.60%)      
Brandywine            
Unpaid Losses and Loss Expenses [Line Items]            
A & E - loss reserves, net - closing 782 837        
Westchester Specialty            
Unpaid Losses and Loss Expenses [Line Items]            
A & E - loss reserves, net - closing 115 119        
Ace Bermuda [Member]            
Unpaid Losses and Loss Expenses [Line Items]            
A & E - loss reserves, net - closing 83 85        
Run Off [Member] | Insurance - North American P&C            
Unpaid Losses and Loss Expenses [Line Items]            
Net losses and loss expenses incurred in prior years 200 247 $ 193      
Run Off [Member] | Completion of reserve review | Insurance - North American P&C            
Unpaid Losses and Loss Expenses [Line Items]            
Net losses and loss expenses incurred in prior years 170 215        
Run Off [Member] | unallocated LAE - run-off | Insurance - North American P&C            
Unpaid Losses and Loss Expenses [Line Items]            
Net losses and loss expenses incurred in prior years 30 32        
Run Off [Member] | Insurance - North American            
Unpaid Losses and Loss Expenses [Line Items]            
Prior period net unpaid reserves represented by prior period development (percent)     (1.20%)      
Active [Member] | Insurance - North American P&C            
Unpaid Losses and Loss Expenses [Line Items]            
Net losses and loss expenses incurred in prior years (239) (354) $ (327)      
Active [Member] | Long tail | Insurance - North American P&C            
Unpaid Losses and Loss Expenses [Line Items]            
Net losses and loss expenses incurred in prior years (169) (298)        
Active [Member] | Long tail | Directors and Officers (D&O) Portfolio | 2009 and prior | Insurance - North American P&C            
Unpaid Losses and Loss Expenses [Line Items]            
Net losses and loss expenses incurred in prior years   (104)        
Active [Member] | Long tail | Excess casualty business | Insurance - North American P&C            
Unpaid Losses and Loss Expenses [Line Items]            
Net losses and loss expenses incurred in prior years   (55)        
Active [Member] | Long tail | Excess casualty business | 2003 | Insurance - North American P&C            
Unpaid Losses and Loss Expenses [Line Items]            
Net losses and loss expenses incurred in prior years   (42)        
Active [Member] | Long tail | Medical risk operations | 2009 to 2010 | Insurance - North American P&C            
Unpaid Losses and Loss Expenses [Line Items]            
Net losses and loss expenses incurred in prior years   (40)        
Active [Member] | Long tail | Financial solutions business | 2010 and prior | Insurance - North American P&C            
Unpaid Losses and Loss Expenses [Line Items]            
Net losses and loss expenses incurred in prior years   (35)        
Active [Member] | Long tail | Surety business | 2012 | Insurance - North American P&C            
Unpaid Losses and Loss Expenses [Line Items]            
Net losses and loss expenses incurred in prior years   (27)        
Active [Member] | Long tail | Surety business | 2013 | Insurance - North American P&C            
Unpaid Losses and Loss Expenses [Line Items]            
Net losses and loss expenses incurred in prior years (24)          
Active [Member] | Long tail | Other lines | Insurance - North American P&C            
Unpaid Losses and Loss Expenses [Line Items]            
Net losses and loss expenses incurred in prior years   (48)        
Active [Member] | Long tail | Auto Liability Excess Lines | Insurance - North American P&C            
Unpaid Losses and Loss Expenses [Line Items]            
Net losses and loss expenses incurred in prior years (32)          
Active [Member] | Long tail | Auto Liability Excess Lines | 2009 | Insurance - North American P&C            
Unpaid Losses and Loss Expenses [Line Items]            
Net losses and loss expenses incurred in prior years   (21)        
Active [Member] | Long tail | Workers Compensation [Domain] | 2013 and prior | Insurance - North American P&C            
Unpaid Losses and Loss Expenses [Line Items]            
Net losses and loss expenses incurred in prior years   32        
Active [Member] | Long tail | Workers Compensation [Domain] | 2009 and prior | Insurance - North American P&C            
Unpaid Losses and Loss Expenses [Line Items]            
Net losses and loss expenses incurred in prior years 29          
Active [Member] | Long tail | Workers Compensation [Domain] | 2014 | Insurance - North American P&C            
Unpaid Losses and Loss Expenses [Line Items]            
Net losses and loss expenses incurred in prior years (21)          
Active [Member] | Long tail | Workers Compensation [Domain] | 2014 and prior | Insurance - North American P&C            
Unpaid Losses and Loss Expenses [Line Items]            
Net losses and loss expenses incurred in prior years (52)          
Active [Member] | Long tail | General Liability [Member] | 2010 | Insurance - North American P&C            
Unpaid Losses and Loss Expenses [Line Items]            
Net losses and loss expenses incurred in prior years (26)          
Active [Member] | Long tail | Management And Professional Liability Lines [Member] | 2010 and prior | Insurance - North American P&C            
Unpaid Losses and Loss Expenses [Line Items]            
Net losses and loss expenses incurred in prior years (108)          
Active [Member] | Long tail | Commercial Excess Lines [Member] | 2010 and prior | Insurance - North American P&C            
Unpaid Losses and Loss Expenses [Line Items]            
Net losses and loss expenses incurred in prior years 33          
Active [Member] | Short tail | Insurance - North American P&C            
Unpaid Losses and Loss Expenses [Line Items]            
Net losses and loss expenses incurred in prior years (70) (56)        
Active [Member] | Short tail | Insurance - North American Agriculture            
Unpaid Losses and Loss Expenses [Line Items]            
Net losses and loss expenses incurred in prior years (45) 34 $ (13)      
Active [Member] | Short tail | Energy and Technical Risk Property | 2012 to 2013 | Insurance - North American P&C            
Unpaid Losses and Loss Expenses [Line Items]            
Net losses and loss expenses incurred in prior years   $ (20)        
Active [Member] | Short tail | Excess Property Lines [Member] | 2013 | Insurance - North American P&C            
Unpaid Losses and Loss Expenses [Line Items]            
Net losses and loss expenses incurred in prior years $ (34)          
Active [Member] | Insurance - North American            
Unpaid Losses and Loss Expenses [Line Items]            
Prior period net unpaid reserves represented by prior period development (percent)     (2.10%)      
[1] (1)Excludes unallocated loss expenses and the net activity reflects third-party reinsurance other than the aggregate excess of loss reinsurance provided by National Indemnity Company (NICO) to Westchester Specialty (see Westchester Specialty section below).